The issue is high fructose corn syrup (made from corn) versus sugar. According to Lessig, the price of sugar (high relative to corn) and the price of corn (low relative to sugar) are both a result of market tampering. See 2.17 into the video. (And in both cases, again according to Lessig the tampering was straightforwardly paid for by lobbying, which is apparently a very good investment. That is, it works very well.)